How To Create Safe Button And Activate It ?

import java.awt.event.*;
import java.awt.*;

public class SaveTest {

public static void main(String[] args)
{
final JFrame frm = new JFrame();
JButton btnSave = new JButton("Save");
final JFileChooser chooser = new JFileChooser();
btnSave.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae) {
int result = chooser.showSaveDialog(frm);
if (result == JFileChooser.APPROVE_OPTION) {
System.out.println("The file will be saved as " + chooser.getSelectedFile());
} else if (result == JFileChooser.CANCEL_OPTION) {
System.out.println("Canceling");
}
}
});
frm.add(btnSave, BorderLayout.NORTH);
frm.setSize(400, 300);
frm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frm.setVisible(true);
}
}

import javax.swing.*;